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# Tag Archives: parabola

## Force on a charged particle

What is the force experienced by a charged particle moving perpendicular to an electric field? I understand that when it is moving parallel to the electric field, it accelerates.

(Shrishti asked)

Answer:

When a charged particle is at rest in an electric field, it experiences a force in the direction of electric field (if it is a positive charge)

If it is moving in the direction of electric field, it will be accelerated.

If it is moving opposite to the electric field, it will be decelerated.

If it is moving perpendicular to the electric field, its trajectory will be a parabola, similar to that of a horizontal projectile

## Path of an object

If a man tossed a coin in a moving train and the coin fell back . Then in which type of motion train is moving? and how?

CHANDRIMA

**Answer**

For the person who tosses the coin the motion is vertically upward if he do so. But for an observer outside the train the path of the stone is a parabola.This is due to the horizontal velocity of the stone.

If the stone fell back, it means that the train is accelerated. If it were moving with a constant velocity, then the stone would’ve reached back to his hands only as both the train and the stone possess the same horizontal velocity.